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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ead428648bcb260b05cb59507f25baf04932858cb6173fd0a472993175b22ed' 
  AND token = 'z8Cc+lP0J9mXOtAGjeqoop30IQbvSo+J5FSE6uF1riY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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