SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bafb9f70c3a65854d2c8bf38672538ee008268b58e5fe32c41cf80da72f8fe9' 
  AND token = 'oGF+MwMV9HQxUzQ3g81QLDuhYCGIEdJjw7qqEDtB40U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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