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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6047226f9a7503d795495d79d9b7eb78f05cc9b3172cd26ce3ab7a04b9540fb' 
  AND token = 'p45mzZeGOtUqcNm3TP71C1e6WhNljAHS2Dlb869UrHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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