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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f5b7a393bd2d67296e3fa2e16de624582104a7def11a091a103995a14f6eb21' 
  AND token = 'Y93QUiOfWBADg0caUqkJ8w77ojrHH/tZWJzZLR9HzDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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