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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2c193e239e4e39e2a28e9993a8f918521b8c5d8a18f95813a5af9babcd96ba' 
  AND token = 'WgLfzWCltmjWT58X/1D6enTkOKCFHWw9E1OdiFKwBwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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