Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255aa30c0995eb51a7cb852e11e20afea1451ecb7bbba2a5daf03e377a9d3f8f' 
  AND token = 'st2BWJTgiAvFkgY66VxehKnpdS/IycmtcEOiDvPl/mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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