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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba117ec856bfa3b680d199c62fbc8ad3c1ace0f822f09aa53781c9a59197c51' 
  AND token = '9g3FI3EErClX2TJVdGVVeCmORj5UFyLCu6xVR0XI1Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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