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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91fc47183e0c0ab6160880efad9f20e4f3223247ac91bb2119d7edc78a051df1' 
  AND token = 'LQAcVucmtzAiVJka74ehpmjcEVeyJD5hFKMSbnD7vZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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