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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af609c9ef223f8ce981cc0069727a7c75155841b5f89a8a092fb05a3df0bb32b' 
  AND token = '3Cj0h0nhZaVodXy4oigLQvI0IgRY01hUi0xSajKT5cs=' 
  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"
    }
  }
}