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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be301fc3007a23d5daa146c8be42858b43ca2685a9f0f49aed0fee1d633a503' 
  AND token = 'XbFwrUjUCj23NcNoJkXzhfa8iThxkpCz9I3YGV/a0+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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