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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8841aa5567652494917fc28060933847713f2d44002179e104a81e879b4c2df' 
  AND token = 'QXss3P/j0zJs6cYg1BzaDWRZm/f2oOLIumQpk7df4yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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