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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c7f041b4fc01e905cb252b08cc71c389ec70e4d045f818d75da9cb2ff4092b' 
  AND token = '7t/9UWOFWp1FxVERfHyN1unjdz/zB/6oxDyKFxRFZco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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