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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1bc716652e960e9ab2031fe9d7e077c400b099622d31e491181e5c23ee6d95' 
  AND token = 'i+dF/zwUZM2PEOhUhgva9zIdpsq0zMUNwAUhznhjk84=' 
  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"
    }
  }
}