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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf18eacea4c6e110daa507f78a3fda5d1f64e6af8b148f9a5d3ecdf2116dab68' 
  AND token = 'WPmnZZeD4dUeU9aEH8AwiXIY7z6FN/TybWmob0zUbjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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