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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5185ea7dbe7f53afdadd2cb697203e0485f945e5ad59c2c5dc63c3cc4f35ac' 
  AND token = 'CV7c/Na47AJ530t35VMtg5fRORNSRvljfPZMJ2dyN84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}