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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2958a4044e26400a5493989d73c00a5c7c40bb6df0bb5b960c5a3ccc219b0250' 
  AND token = '0hAh4Rh5Sa3mT3Gefd5mjeSckP1tXioSYdnyF6Vj8sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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