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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6517b366a693aff99ef0daf711e64fa993bdabd063807c886feaa51cfc54658f' 
  AND token = 'wdm/HXXc1rzv9EYmLjMQas1B1khy0udpgDI/LQbM/EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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