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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f1b63ffbb4d9e044c3cb3a72d9062bb95525d8bdfb36486e8ba82e56895f54' 
  AND token = 'mwSSnX5HTkvq92Nk0WtlVF/7ErvED9cXWd73YVIO82A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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