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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2805e1fca2c5902ab365b080e21c9571e530bb103f4b86ea83a87ef134faaca4' 
  AND token = 'VyGV+K0WV9rM7MThO3ea09dv8Q0XlrOnV6ocEaPs1jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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