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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd69f86dbd73da8e830ee4527dce5dc4172dbb16bff81d5b1c0174da3b5c44c5' 
  AND token = 'mNjrDrErirZ775XBxXhfXc9SgJYD0dXBYq717GpOoiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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