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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92eb50cd63a6ad47a60d1e558ec404215462cbf683a13ac5a2d2a80118307ab6' 
  AND token = 'f2344aw0sCKZcmd5CW94x1RdYVFbzoWy+EEQWvUDofM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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