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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50948e5274595471cebf8ee7d092931df49e07b58f309ac90ea7257effb5514' 
  AND token = 'arefPa07XX2E1of0sS9beKHkmF44/SxOd0luMTJjM8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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