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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd644af01a402dcc6e5462c3909d23dedf6aa18b470becabfe007bea64f82fe2' 
  AND token = 'DmItoSSlo4sRmP38fPRI7AXdlKDzUM9r4fK+ofSZ0Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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