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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b34cc24ddb3cbf9d2d6116a10b7a52995da2fd23ee400142414e77324f60727' 
  AND token = 'zckhBEaSzTx9ljNMz3Y4fGNNEva4a3/9bj7kI8Y4PAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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