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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326460ec0d0bc1df835365d91792f341a7955a86dd88a68e2ca6eaafb9247055' 
  AND token = 'Ph7I2ox9T9zBnNX4NKzKBtWNoqxz4by38W1uY+eCLmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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