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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b5997a461fe02b2b44ed67b6abd5edabf150b4c75ee3b318c44e5aeb061939' 
  AND token = 'nCM0/TvafChyK96/GFuyUQW2V+ml+4HKmr/mw21KLss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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