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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ed2b00fd7648a4bfb3ffe8fba9a6ab7fce52733da19ae916c377e1146f1116' 
  AND token = 'I8fvOoN/ppBMSK8SS+LKeLO79MeYRo7iuRHYcUi37D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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