Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6510c64ac4a413254f9f5d76f8252620add8c9b1ca3252198dfac2547aaed6b3' 
  AND token = 'jrTe67j2pdo29MfIbUFfE6gmVNGo4UF3U39fISiVUv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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