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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8839710de8cf67390fd6ebe68093acb2e720e0e30f6a300a845429fe1fa98751' 
  AND token = '8dDnStb9u72E26EypyQPKBjjP9/v394UIUCoHBz4TGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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