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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1428fbf1b3b683b6672aca99b0e755d8f868d135edf9b217cecbeac0ef8f1b9b' 
  AND token = 'nsdb9xHMFz0wfHcl87zD4/3B9UA2BfrC5AeM+gnuy6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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