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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ad6bfeef7def85e8493105785ec78cb3288171dd5a9af14d642d0466f571e2' 
  AND token = 'uyFbc5461n8TYB1eHZRKDlQzgJrTaq3M0dXfHN5GRRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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