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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e7277e26c44e9566036be0e9882a894fcc276ffc446d11810340ce24f1af1f' 
  AND token = 'RxqUfKX1Q+Gcxh1jB8RnDIXika72Xi3Xwq1buHGCW+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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