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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f9e89eb1954daee97214a52ba4dbb34b8a30e07eafc8bea4cbb88b654a2b34' 
  AND token = 'Jpxk0siaGe6e2o9frCrlZ1m7WF/t68K70y0SlVPj77U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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