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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5769874eee098bc684a6d657057b6384b07459cedae3bd5f6685f37ec09ace3f' 
  AND token = 'ZinwkgMhSWE02LefZ5lJAviSgqvYHntAYzFz1yvoTqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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