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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11d594e707c63d2b5401ff7b3a88e2bccba1089a803b531c3cafe0983988436' 
  AND token = 'ySSmzY1kK2sIhpyEqj0gcZV0Q0MFj4oIug9Rvh8k3zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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