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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21fb7246ca5e9ac3d31e917005062531c9a1c49ab4fe0f9b71ee9115090e4d9e' 
  AND token = '9mGDGUtzUsYtF9/XhGhCb67j+qg461RZ2OaZvtbMNsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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