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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb8dd0ef14342ecd4f83035228c16cb9ff6de1a5b019552aa93d53227b7bdb0' 
  AND token = '7zv1liTQ2XxYHua2rEthva9LtfuIAvKUYUsqi1RaF4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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