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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7cdb93f52dd2fb46f35dd0d6c19d1cb34d6ed74cbf07e5eca581545ed918388' 
  AND token = 'LQ7hgwVw5SITlXHw0S0d1pvPt7rDw8oPbk4fxk0iQbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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