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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bade599123e9c08de4b881816e45cb38fec693c4eb1ff4d6982e2efeadbc7527' 
  AND token = 'y/L969BM08gRybOWCrg1+BD1PP0miueB13IkD0PXONE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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