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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d142917eb4ee3f60e6770f65c18f12cb8b9caf1b07849a79998d866a4ec59f5' 
  AND token = 'YQ5DVWG7YRORb1jzPA2m/5cSX3zYh9SXcnYE4W9YMlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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