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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b44ff41e448964cc131f63df55f8f736ca12c6ada08fa2c5e58a12bb4a0ae4' 
  AND token = 'B6S+cyW3itk27zA3W/Lg2dmmVXLDKgjwO4i24d+bMow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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