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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcb4d80efc70f3bc259ed3f460bef2c01cc984c02413c545c25b82dfb77cdc4' 
  AND token = 'yH0muT+yQOo++l56vtxs7MBKCWoV5mpC6hu7Ajn8iqc=' 
  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"
    }
  }
}