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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c55d9f033153958c0493b873ec269e7f27654a2652289da21d78fcb19b4014d' 
  AND token = 'A3qYxF2ag7cEAaYeqY67tnfnxQjJ8cyQv1sDikI0DKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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