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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1611c2c713b5a115f9f9320ac878a42568006c10493621864ae4a347100aefd' 
  AND token = 'FWi8df1qTTpzfLuNVINpVaX8tqRON3d4ZDu/rG64IEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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