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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d16937c8394260bd3ddb56c8dcc84c88a77f339ade1a3357cf3a58994d4252c' 
  AND token = 'xgbw2jW9KxG/f++QtbqiPVLFid3CNZQYLsf3EcQx0/8=' 
  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"
    }
  }
}