Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9f5eb821502e47ee3e4e0e3b98d2b2f1ba3047176d19ce7a77ecd78b73262a' 
  AND token = 'cUHe56vcFobpOws1ZhnARop2/ny7XBvfHyX7vqqeORI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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