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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24fea7f35a01a2b6720172e958a64b313d9e0f3b93cf3b9da5d9d562c1199b9' 
  AND token = 'x5HBbYF8V8Yg5epJneOKxjWyi4rsqP+IBTna1Zkg23I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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