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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2883446bfb5d2488cc1aeffa85b1bf03fe6da04ae3a8d72eb4f134854be1af88' 
  AND token = '1W2YEXezXf60dLLUyYu2p/HS7hXSDylDG4BXDknvdd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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