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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59719669afb43d9e061622efbd9c273ab6b431df6663f1ebf85398af1ee2c7c' 
  AND token = '3gfkJZXCYcdgsdl5WyXfO2uEn8RH7pRprVTiqBV16UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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