Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e480ae2476b54a1af055c50b0adf0ccf1f0a621908437a9b0102fa0b51302d5b' 
  AND token = '8Xi7sH9Z+48SMr87Lx5JP5h8/bDLdP1DCi0Va3Nkq2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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