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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2c7ba9e7e193ddedf4b4c7e04f93464c9f1fe8c19c74b451fd789a5073a2fa' 
  AND token = 'onvnlRT/Bqm77za3RFYrv3P8/NUB3WS3GAuqNhp1lec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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