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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94d4d9b74a965b8c625f1d22786a54f8137ebab15eaafa2a85b37a7a9501922' 
  AND token = 'h0ZxQXISRugcPJzSOewoblS5kBhctfUbeF/derFHJMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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