SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f231ab37729348d917102108a77e23e92c939105f5798fd4ec530446af35cb5' 
  AND token = 'NxOnX7AsGHllbvqkHjg/+svX+TxYGaKbJACE4wEnm6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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