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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e764b5851ab2d57f0fe1d5efa97850002ec3b1c3e56d76def1500527c27565c5' 
  AND token = 'E51fHem9H6ZIrQOTD6h1wnhKBOj7ZCrJorfSG7RZvfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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