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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbbdc6fa1e43f67069b0e64e050e00a3aa60cae947c3bd0657a025b1a171e99' 
  AND token = '41EmhLNidl6RMBuCbcG0/L4Rlwusf+TjrW8YdxOkxKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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