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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8a7a2260ec514db0c1e45697d4e16f21e41e201477a24e63c1eec5c991738b' 
  AND token = 'sxWFjU19J1xTGf/AyXkM7xBgmr4OINfpBuzLxKbGz9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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