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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d6f4cd5e6215a07704e39d69910046d2be04fab93255d794226ee84a70cca5' 
  AND token = '9+Ai1KM+IBbQtI7dzGHcCQ8zcTUHCgys4apGF2p7ZD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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