SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40ae941c56dc2eef33b8988b88a629cf8571a34644e0ba7d65a85613b72aac3' 
  AND token = 'RgvqK+e7NJANvBZ7gbxGZMs5hMcy9mREElPDIQFj70g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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