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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1885b30fcaaec051f938cc6d85e7dda5d0ed3fd1ef4cb1dffd5a79cd0980f6ea' 
  AND token = 'gQOHTYe2Pmg0ROml5bsCx7St7zn1T55819l6bYlyhFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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