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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a7b6c2880197fb22c96643f661c2a5ea1fe7e36a221a2476ece5c7b9ea0674' 
  AND token = 'na+fAYm77hZGtIBAaoph7e0D0cIn/qjmI1HudARV7Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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