SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8be46589ea8535ba4658f9410763615a80d6f60a2bad714452da5d24d713af' 
  AND token = 'cGP0f6s+UpCBFgRcLtC+uEv/n2BdJK2oeuBgICvXhko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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