SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58485e0f84968d9c291832a027ce48af86145c7b610effc193a74dfb39dfe3ac' 
  AND token = 'sY77ZHLJKqRHS/ZFUhe5U9lCXhNo3lxUJmVyG9h+XNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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