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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f80f8bab8638ea3f0f9c82317cb51921776bee28811250e2ebe72211f8bcd3' 
  AND token = 'YnR5qd2XDhiT6nP719iT/ctP49FrYmbKTNgEm91LE5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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