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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4df4475c7cdfb84b942ee1170fa96ea18b55b992450b44709bc67f4835c824' 
  AND token = 'LsBxRFYHONnAIw1P/RfZOPtvARDJg/Sg6kU6PU9cSQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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